I understand how difficult this journey can be to diagnosis and treatment. There are so many things that can contribute to POTS, I don’t think anyone would be comfortable trying to provide a quick list… Having said that, after checking for heart abnormalities, pheochromocytoma and often carcinoid cancer (blood/urine tests), I like to see a QSART test to check for autoimmune autonomic gangliopathy. That is the one condition we don’t see at POTS Care because it requires ongoing immunosuppressives and experts in autoimmunity are important for those patients. Others fall into “idiopathic POTS” and usually pass a QSART (after ruling out other causes of neuropathy that are not autoimmune). Those are the folks we like to see at POTS Care. Hang in, my friend.